During the shutdown, Metso was responsible for replacing the concaves and the mantle of the primary gyratory crusher, the linings of three grinding mills, and the lower frame of the large cone crusher, in addition to repairing two apron feeders.
“Metso had prepared carefully for its four jobs, which was positively reflected in the end result. Risk levels during the work remained low, and the sites were completed on time, or even ahead of schedule,” says Heikki Kamula, Head of Mechanical Maintenance at Boliden Kevitsa Mining.
“One positive thing was that we spent considerably more time and resources on the risk assessments for the work than we used to. This was evident in the high level of safety and order on the site,” Kamula continues.
“In addition, Metso very actively monitored operations to detect any dangerous situations and responded to deviations immediately.”
Planning began four months before the shutdown
The Boliden Kevitsa mine has eight maintenance breaks a year, with each break lasting for around 16 hours. In addition, there is a six-day shutdown every year, which this year was in mid-May. In addition to the mine’s 380 employees, the maintenance shutdown involved around 300 external workers.
At Metso, planning for the shutdown began four months beforehand.
“We allowed plenty of time for planning in our team. For most of our projects, we prepared hourly schedules divided into work phases. These were printed out for the sites for easy monitoring of progress,” says Lauri Ylönen, Mining Maintenance Manager at Metso Finland, based in Tampere.
“Our four projects were completed ahead of schedule, meaning our entire team did excellent work. Our international maintenance team included people from Finland, Sweden, Canada and New Zealand.”